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首页> 外文期刊>Polymers for advanced technologies >Structural modification of chitosan biopolymer as a novel polyelectrolyte membrane for green power generation
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Structural modification of chitosan biopolymer as a novel polyelectrolyte membrane for green power generation

机译：壳聚糖生物聚合物的结构改性，作为绿色发电的新型聚电解质膜

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摘要

In the present study, a series of bioresource polyelectrolytes based on chitosan were synthesized and assessed for applicability in direct methanol fuel cells (DMFCs). A binary cross-linking agent (sulfosuccinic acid/glutaraldehyde) was used for the structural modification of chitosan and membranes comprising various amounts of sulfosuccinic acid (0, 8, 12, and 16 wt% SSA/wt chitosan) were prepared. It was found that by increasing the sulfonate groups' content up to 16 wt%, proton conductivity and methanol permeability properties reach the values of 0.0452 S cm~(-1) and 9.6×10~(-7) cm~2 (sec)~(-1), respectively. Based on the membrane selectivity evaluation and activation energy measurements of proton conduction, the optimum composition of cross-linking agent was determined. The optimum composition resulted in a relatively high proton conductivity of 0.0452 S cm~(-1) and a low methanol permeability of 9.6×10~(-7) cm~2 (sec)~(-1). Moreover, the optimum proton exchange membrane exhibited selectivity value of 47,100 in comparison with the corresponding value of 40,500 for Nafion 117. The fabricated membranes showed acceptable oxidative and hydrolytic stability. Furthermore, single cell DMFC performance test revealed a power density of 17 mW cm~(-2) at 30℃ and 41 mW cm~(-2) at 60℃ in a 2M methanol feed. Hence, prepared proton-conducting bioresource ionomers could have promising potential in the field of green power generation as a low cost and biodegradable polyelectrolyte.
机译：在本研究中，合成了一系列基于壳聚糖的生物资源聚电解质，并评估了其在直接甲醇燃料电池（DMFC）中的适用性。使用二元交联剂（磺基琥珀酸/戊二醛）对壳聚糖进行结构改性，并制备了包含各种量的磺基琥珀酸（0、8、12和16 wt％SSA / wt壳聚糖）的膜。结果发现，通过增加磺酸盐基团含量至16 wt％，质子电导率和甲醇渗透性达到0.0452 S cm〜（-1）和9.6×10〜（-7）cm〜2（sec）。 〜（-1）。基于膜选择性评估和质子传导的活化能测量，确定了最佳的交联剂组成。最佳组成导致质子电导率较高，为0.0452 S cm〜（-1），甲醇渗透率较低，为9.6×10〜（-7）cm〜2（sec）〜（-1）。此外，与Nafion 117的相应值40,500相比，最佳质子交换膜的选择性值为47,100。制得的膜表现出可接受的氧化和水解稳定性。此外，单电池DMFC性能测试显示，在2M甲醇进料中，功率密度在30℃下为17 mW cm〜（-2），在60℃下为41 mW cm〜（-2）。因此，作为低成本和可生物降解的聚电解质，制备的质子传导性生物资源离聚物在绿色发电领域具有广阔的发展前景。

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